I like this model. I will happily take it to work.
The specs shown in the Sofirn VDO above read 1000 lm for 2.5 h, presumably regulated. To see if it’s feasible, I looked @koef3 SFT25R test and assumed that the OTF lumens are some 80% of what the naked LED puts out.
With 4 LEDs, one needs some 320 lm out of each to get 1000 lm OTF. That translates to some 2 W delivered to each emitter, or ~8 W total. Assuming the driver efficiency to be a likely pessimistic 80%, that should require not more than 10 W draw at the battery (at perhaps 2.5 A).
@HKJ tested the Sofirn 21700 cells and arrived at some 17 Wh (down to 2.8 V) at similar discharge rate.
So, according to this logic, and assuming that the heat dissipation sustains it, I predict that this flashlight could maintain 1000 lm for almost 2 hours on the OEM battery. The 2.5 h quoted in the table probably includes some half hour+ ‘reserve’ after the final step-down as Sofirn has done with HS21 for example.
4 Thanks
Sofirn go. 
Sofirn go
Sofirn Go!
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Sofirn Go
1 Thank
Sofirn Go
Hee Haw Holidays
1 Thank
Sofirn go!
Please concider using 5000 kelvin SFT25-R’s instead of 6500 kelvin ones.
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Sofirn go
Sofirn go
Sofirn Go !
Sofirn Go.
Very curious how it holds up.
Go Sofirn Go!
Nice looking light. Thanks!
Sofirn Go
Sofirn go!
Thanks for GAW!
Sofirn Go
Sofirn Go
Thanks for the GAW and another vote for the SFT25R 5000K.
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Sofirn Go
Sofirn go
Sofirn go!